Miami: Federer suffers surprise defeat

The Swiss top seed Roger Federer suffered upset defeat to Czech Tomas Berdych in the fourth round of the Open in Miami. Fourth seed Rafael Nadal beat fellow Spaniard and 15th seed David Ferrer 7-6 (7-5) 6-4 to qualify for the quarter final. Federer was beaten after a tight battle 6-4 6-7 (3-7) 7-6 (8-6). American star Andy Roddick has qualified for the quarter finals, he fought back from 4-1 down to defeat Germany's Benjamin Becker 7-6 (7-4) 6-3. Jo-Wilfried Tsonga, who trounced Juan Carlos Ferrero of Spain 6-2 6-2. Robin Soderling of Sweden progressed with a 6-0 6-7 (3-7) 6-2 victory over Chile's Fernando Gonzalez, while Mardy Fish of the U.S. was forced to retire while trailing 6-1 1-0 against 13th seed Mikhail Youzhny. In the women's tournament, Venus Williams advanced to the semi-finals with a 6-3 6-1 victory over Agnieszka Radwanska. She will face France's former Wimbledon finalist Marion Bartoli, who beat Yanina Wickmayer 6-4, 7-5.